INTERGRANULAR TRANSPORT-PROPERTIES IN C-AXIS ORIENTED YBA2CU3OY POLYCRYSTALLINE FILMS

The current-voltage (I-V) characteristics and the resistive transition under magnetic field were extensively investigated on c-axis oriented YBCO polycrystalline films with a different amount of an in-plane gra in alignment. All the parameters deduced from the scaling analyses in the intergranular region along with the vortex-glass-to-liquid transit ion indicate that the intergranular current transport is not via weak links but is due to strongly coupled channels regardless of a degree o f an in-plane grain alignment. (C) 1997 American Institute of Physics.